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US 10,648,266 B2Granted
Downhole milling cutting structures
AssigneeWellbore Integrity Solutions LLC
InventorsZhenbi Su, Vijayakumar Palani, Sudarsanam Chellappa, Jianbing Hu, Christopher Glass, Timothy Andrew Burdett
Life of this patent
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Abstract
Systems, tools, and methods include using a milling assembly with a mill having multiple, different types of cutting element inserts. A gage region of the mill includes a first type of cutting element insert, and a shoulder region of the mill includes a second type of cutting element insert. One cutting element insert may include chip-breaking features, and the other may be a shear or gouging cutting element.
Claims18
A downhole milling tool, comprising:
- a drill string;
- a lead mill at a downhole end portion of the drill string;
- and
- a second mill coupled to the drill string, the second mill being at least one of a dress mill or follow mill, the second mill including:
- a plurality of blades including a first blade and a second blade;
- a gage region of at least one blade of the plurality of blades having a first type of cutting element insert;
- and
- a shoulder region of the at least one blade of the plurality of blades having a second type of cutting element insert, wherein the second type of cutting element insert is different than the first type of cutting element insert
- wherein the first blade comprises a first configuration of at least one of the first type or the second type of cutting element inserts, the second blade comprises a second configuration of at least one of the first or the second types of cutting element inserts, and the first configuration is different than the second configuration.
6 more elements
A follow mill, comprising:
- a body integrally formed with a tubular on each opposing end of the body;
- a plurality of blades extending axially along, and radially from, the body, the plurality of blades defining a gage region and a tapered shoulder region, and the plurality of blades including a first blade and a second blade;
- a first plurality of cutting inserts in the gage region of the plurality of blades, the first plurality of cutting inserts being chip-breaking inserts, wherein the first blade comprises a same type of chip-breaking insert as the second blade, the chip-breaking insert of the first blade is in a first orientation, the chip-breaking insert of the second blade is in a second orientation, and the first orientation is different than the second orientation;
- and
- a second plurality of cutting inserts in the tapered shoulder region of the plurality of blades, the second plurality of cutting inserts being different than the first plurality of cutting inserts in the gage region and not being in the gage region.
2 more elements
A method for milling a window in casing, comprising:
- tripping a downhole tool into a wellbore, the downhole tool including at least a lead mill and a dress mill or a follow mill;
- forming a window in casing around the wellbore using the lead mill;
- and
- moving the lead mill through the window, and expanding the window or cleaning casing around the window with the dress or follow mill, wherein expanding the window or cleaning casing around the window includes:
- using a shear cutting element insert in a shoulder region of the dress or follow mill;
- and
- using a chip-breaking cutting element insert in a gage region of the dress or follow mill.
4 more elements
Dependencies are inferred from the claim text.